| Summary: | 碩士 === 大漢技術學院 === 土木工程與環境資源管理研究所 === 106 === This study adopted ground-penetrating radar (GPR) and resistivity image profiling (RIP) to survey the known depth and landfills of various qualities.Thus, the delivery rate of electromagnetic waves within the stratum above the landfill was acquired. Besides, this study compared the results, which were surveyed in different arrays of geoelectrical resistivity, and acquired the conclusions as follows:
(1) After calculation, the delivery rate of electromagnetic waves above the landfill landfill was 0.075 m/ns, which was close to that surveyed in the silty component inthe laboratory.
(2) Within the GPR surveyed cross-section, the landfill of good metal conductor had a biggercross-sectional area, and the reflected signals were clear; the landfill of poor conductor hadweaker reflected signals.
(3) Within the GPR surveyed cross-section, the electrical resistivity rate in the stratum above thelandfill could be divided into west and east sides: the west-side (Layer A) electrical resistivity rate was 105Ω-m, with a width of 14 meters and a depth of 1.5 meters, which was read as discrete backfilled formation; the east-side (Layer B) electrical resistivity rate was 5~200Ω-m, which was read as compact backfilled formation. Below the landfill was undisturbed formation (Layer C) with an electrical resistivity rate of 200~770Ω-m, which was read as the feltiest component.
(4) Within the four arrays of geoelectrical resistivity, with pole-pole differences of 0.5 m and 1.0 m,the survey cross-sections all indicated that the electrical resistivity increased as the depth grew larger. After excavation, it showed that the formation component was discrete, and the increased porosity soaked soaked more water, so the electrical resistivity lowered.
(5) Using the pole-pole array, within the survey cross-section with a pole-pole difference of 0.5m, the electrical resistivity above the landfill had a higher resolution than that with a pole-pole difference of 1m.
(6) If one desires to raise the survey depth for geoelectrical resistivity method, he/she may increase the survey layers or pole-pole difference.
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